ISSN 750-983 (prnt) Internatona Journa of Sports Scence and Engneerng Vo. 04 (00) No. 0, pp. 06-4 Takng about the Infuences of Heght and Technque for Obtan the Rebound on the Basketba Gae --------Based on Men's Basketba Matches of 9th Oypc Gaes Jng L + Shangha Sport Unversty, Shangha 00438 (Receved October 6, 009, accepted October, 009) Abstract. Ths study attepts to quanttatvey anayze the factors about payers heght and reboundng technques, researchng nto the effects of heghts and sks on securng rebounds. The resut ndcates that the nuber of rebounds that teas whose average heght of power forwards and centers s ow get s fewer than that nuber of rebounds teas whose average heght of power forwards and centers s dde and ta get, and because of the tte necessty of pont guards and shootng guards partcpatng n rebounds, the Regresson Coeffcent and Correaton Coeffcent of tea ebers are coparatvey ow. In the tea whose average heght s ow but power guards and shootng guards are reatvey techncay hgh, the technca superorty can ake up the weakness of the heghts. In addton, the tea whch s not dependent on heght but st does we n the copetton s superor over other teas n ters of the technca vaue. Therefore, besdes heght, technques can aso be one of the donant factors of securng rebounds. Takng these two factors nto account thoughtfuy the power of the tea can be estated objectvey and effectvey. Key Words: rebound; heght; technque. Foreword Basketba s a fercey copettve sport. In the offensve-defensve change, both teas try ther best to ncrease ther own offensve tes and restrct the other s for the purpose of hgher scores. So t s acknowedged that obtanng ore offensve tes, whch s aso caed the possesson of the ba, pays an portant roe n wnnng the gae. Securng rebounds s known as the core n the possesson of the ba by professona. As we know, athough the advantage of heght s an portant factor n snatchng rebound, there are other factors affectng the nuber of rebound, such as the body of the contro, bounce, defensve poston, opportuntes, and judge technques and so on. So far, there have been any researches about rebound n Chna, but ost of the x up the heght and technques and ther resuts obvousy can t s expan the probe. If we can separate heght and technques to research about securng rebound and quanttatvey anayze the factors, the power of the tea can be estated ore objectvey and effectvey. An Anayss of the Basketba Gaes on the Heght and Technques of Men s Tea n Oypc Gaes as objects, attept to separate heght and technques to research and quanttatvey anayze the to dscuss how heght and technques nfuence the rebound for the purpose of offerng the reference for Chnese basketba tranng, especay the technques of securng rebound.. the research object 0 atches, 7 teas and 84 payers of 008 Bejng Oypc Gaes are objects n ths study and choose sx of prenary contests by heght dfference. Addtona 4 atches are se fnas and the fna wthout heght dfference. I separatey copare starters of each tea accordng to correspondng poston that s dvded accordng to the nternatona standards, PG (pont guard), SG (shootng guard), SF (sa forward), PF (power forward) and C (center). + Correspondng author. Te:86-3760533. E-a address: -j0@hota.co Pubshed by Word Acadec Press, Word Acadec Unon
Internatona Journa of Sports Scence and Engneerng, 4 (00), pp 06-4 07 Tabe Accordng to heght choce 6 copettons Heght Low VS Mdde Mdde VS Heght Heght VS Low VS ANG VS USA ARG VS ESP SCG VS ANG VS IR VS ARG USA VS SCG ESP VS IR Tabe Not accordng to heght choce 4 copettons(se-fna, fnas) Copettons Se-fna pay Se-fna pay Copetton for 3&4 fna VS ESP VS LTU USA VS ARG ARG VS LTU USA VS ESP 3. research ethods Ths study uses quanttatve ethod as foows. 3.. Weghng nuber acqustons of heght and rebound of pu-out te Changng payers s frequent because of stuaton changes n a atch. Dfferent payer has dfferent puout te, but no atter how any tes a tea changes payer, 5 payers need attend a atch, eanwhe each tea has 00 nutes pu-out te. So t s necessary to cacuate average heght and acqustons rebound of each tea after weghng pu-out te. - f () 00 =Average heght after weghng pu-out te =heght of payers f =pu-out te of payers R 00 Rf () R =The average rebound nuber after weghng pu-out te R =the rebound acqustons of payers 3.. Varance It s based on above data that we cacuate the varance of heght ( ) and rebound ( R ) and covarance of rebound ( R ) f 00 R R f R 00 R Rf R 00 (3) (4) (5) 3.3. Correaton coeffcent Cacuate standard devaton of around regresson ne(σ), then get the correaton coeffcent(p). Standard devaton of around regresson ne(σ) ndcates the stuaton of data dsperson. SSc ea for subscrpton: pubshng@wau.org.uk
08 Jng L: Takng about the Infuences of Heght and Technque for Obtan the Rebound on the Basketba Gae R (6) R R (7) R 3.4. Regresson coeffcent Cacuate regresson coeffcent accordng to regresson ne( ). (8) In addton, cacuate the average of regresson coeffcent of 0 atches scores R 0 0 (9) Cacuate the average of standard devaton because of dscrepancy around regresson ne 0 (0) 0 3.5. Technques Based on data on regresson ne, dfferent heght payers have a dea vaue of securng rebound, the dea vaue dvded by rea vaue s technca vaue (W). Actua Vaue W () Idea Vaue 3.6. The rebound rato coeffcent Accordng to heght dfference, cacuate rebound rato, whch can refect that persona heght gves opponents pressng ndex. V R 4. Resuts and anayss 4.. Anayss accordng to heght dfference 4.. Low teas (IR, ANG) and dde teas (ARG, USA) Heght Dfference () Tabe 3 IRvsARG The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea IR Tea ARG 80(PG) 6.6 0.88 8(PG) 3.05 0.96 90(SG) 3 0.64 0.99 98(SG) 5.56.0 90(SF) 4 0.83 0.63 0(SF) 0.59.0 0(PF) 4 0.63.0 08(PF) 0.6.00 8(C) 3 0.83.07 (C) 7.74.03 SSc ea for contrbuton: edtor@ssci.org.uk
Internatona Journa of Sports Scence and Engneerng, 4 (00), pp 06-4 09 Tabe 4 ANGvsUSA The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea ANG Tea USA 85(PG).49 0.7 94(PG) 0.56 0.85 90(SG). 0.79 94(SG) 3.5 0.94 9(SF) 0.53 0.98 03(SF) 0.4.04 0(PF) 0 0.00.5 06(PF) 5 0.93. 0(C) 3..6 (C) 7.5.0 Tabe 5 IRvsARG, ANGvsUSA Projects coputed resut R R p IR 98.9 3.80 9.49.70 0.0.89 0.09 ARG 98.75 3.3 8.0.95 0.05 3.63 0.0 ANG 93.6.05 5.7.47 0.08.96 0.30 USA 00.4 4.3 8.3. 0.3 3. 0.5 0.7 P.0 obvous reaton,0.4 P<0.7 reaton,0. P<0.4 qute reaton,0<p<0. no reaton Fg IRvsARG The reatona graph Fg ANGvsUSA The reatona graph about the heght and the rebound's nubers about the heght and the rebound's nubers Data shows that PG and SG of IR and ANG are better than ther opponent on technques, especay both countres PG are on the top of the st, respectvey.6 and.49. Centers of dde teas get hgh scores on technques and rebound nuber. In fact, Howard, the Aercan center, pays basketba n NBA as PF. He s outstandng on reboundng technques. Both IR and ARG have ow vaue, respectvey =0.0, 0.09; =0.05, 0.0, t ndcates that there s no obvous reaton between heght and the rebound nuber n both teas, so we can see they are both good at reboundng technques. However, P=0.5 (USA) shows that the rebound nuber reates to heght, n other words, payers who are ta obtan ore rebounds. Otherwse, fro regresson nes of graph and graph, we can see that heght dfference s no reatonshp to payers poston, but there s reatonshp between heght dfference and the rebound nuber. Data of the USA s concentrated on the upper rght and ta payers acqure ore rebound nubers, so the USA s a tea that depends on ta payers to secure rebound. On the contrary, the rebound nuber s average n ANG and we cannot see heght dfference nfuences obtanng rebound so that aost every payer on the fed takes part n securng rebound. 4.. Mdde stature teas (ARG, USA) and ta stature teas (SCG, ESP) We can see fro tabe 4 and tabe 5 that there are soe payers whose W s.00 n ta teas. It states that technca vaue of starters of both teas. Athough two payers are the sae heght, technques pays an essenta roe n obtanng rebound fro the ow vaue of PF n ARG, W=0.3. The sae probe aso happened n the atch, heght dfference s erey 3c, but the gap of technca vaues of two teas s wde. On the other hand, that hgh vaues of the USA(P=0.7) and ESP (P=0.56) fro tabe 6 ndcates that ta payers apparenty have advantages of securng rebounds. Tabe 3 shows that data of SCG concentrates on SSc ea for subscrpton: pubshng@wau.org.uk
0 Jng L: Takng about the Infuences of Heght and Technque for Obtan the Rebound on the Basketba Gae the eft. Athough SCG has a.6 hgh center, he does not have any advantages on rebound. Tabe 6 ARGvsSCG The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea ARG Tea SCG 8(PG) 0 0 0.06 00(PG).00.73 98(SG) 5.8 0.98 03(SG) 5.5.03 0(SF) 0.70.03 06(SF) 3 0.68.0 08(PF) 0.3.4 08(PF).08.4 (C) 6.86.4 6(C) 0 0. Tabe 7 USAvsESP The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea USA Tea ESP 94(PG) 4 6.00 0.77 9(PG) 0.7 0.74 94(SG) 0.63 0.7 00(SG) 3.5 0.96 03(SF) 0.4.09 04(SF) 4.08.00 06(PF) 5 0.97.0 07(PF) 8.06.6 (C) 9.34.0 5(C) 7.7.3 Tabe 8 ARGvsSCG, USAvsESP Projects coputed resut R R p ARG 99.90.80 7..94 0.0 3.9 0.36 SCG 0.75 4.07 6.8 3.06 0.8 7.79 0.4 USA 99.8 4.6 0.59.9 0.0 4.5 0.7 ESP 0.63 3.66 5.65.95 0.9.59 0.56 0.7 P.0 obvous reaton,0.4 P<0.7 reaton,0. P<0.4 qute reaton,0<p<0. no reaton Fg 3 SCGvsARG The reatona graph about the heght and the rebound's nubers Fg 4 USAvsESP The reatona graph about the heght and the rebound's nubers 4..3 ow stature teas (IR, ANG) and ta stature teas (SCG, ESP) Tabe 9 IRvsSCG The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea IR Tea SCG 80(PG).38 0.6 00(PG).8.67 90(SG) 0 0.00 0.87 03(SG) 0.40 0.99 00(SF) 5.35.05 06(SF) 4 0.85.4 0(PF) 3 0.75.0 08(PF) 4 0.75.6 8(C) 5.5.39 6(C) 3 0.4.5 SSc ea for contrbuton: edtor@ssci.org.uk
Internatona Journa of Sports Scence and Engneerng, 4 (00), pp 06-4 Tabe 0 ANGvsEPS The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea ANG Tea ESP 85(PG) 5.47.08 9(PG).00 0.67 90(SG) 6.63. 00(SG) 4.68 0.7 9(SF) 0 0.00 0.97 04(SF) 3 0.75.07 0(PF) 4 3.5 0.78 07(PF) 5..30 0(C) 3. 0.75 5(C) 8.3.34 Tabe IRvsSCG,ANGvsESP Projects coputed resut R R p IR 99.4.59 0.4.74 0.0.06 0.56 SCG 0.4 4.06 6.75 3.7 0.3 9.98 0.5 ANG 93.9.47 5.75.83-0.3.56-0.47 ESP 0.35 3.8 5.50.5 0.43.79 0.8 0.7 P.0 obvous reaton,0.4 P<0.7 reaton,0. P<0.4 qute reaton,0<p<0. no reaton Fg 5 The reatona graph about the heght and the rebound's nubers Fg 6 ANGvsESP The reatona graph about the heght and the rebound's nubers Data shows that technca vaues of PG, SF, and C n IR are a over.0 evdenty surpass the sae poston payers vaues n SCG. Vaues of PG, SG, PF, C n ANG are ore than.0, especay PF (w=3.5) and C (w=.), whch ndcates that both IR and ANG who are ow teas are outstandng at technques of securng rebound, whch akes up for owage n heght. Otherwse, hgh stature teas, SCG and ESP, respectvey =0.3, =0.43, shows that heght has notabe effect on the rebound nuber, and =9.98 of SCG dspays a bg dspersa degree. On the aspect of correaton coeffcent, p=0.8 of ESP, the hgh vaue, shows that ta stature payers have apparent advantages on rebound. But on the other hand, =-0.3,p=-0.47 of ANG dspays that the rebound nuber that ow payers get are ore than that ta payers do. Fro graph 6, we can aso get the sae concuson. 4.. The copetton anayzes wthout heght dfference Tabe ESPvsLTU The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea ESP Tea LTU 9(PG) 5.67 0.85 9(PG) 5 0.95 0.98 00(SG) 4.4.06 98(SG) 5 0.96 0.9 04(SF) 0.43.0 0(SF) 0 0.00 0.98 07(PF) 5 0.85.06 09(PF) 3 0.94.03 5(C) 9.53.7 (C) 5.73 0.87 SSc ea for subscrpton: pubshng@wau.org.uk
Jng L: Takng about the Infuences of Heght and Technque for Obtan the Rebound on the Basketba Gae Tabe 3 ARGvsUSA The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea ARG Tea USA 8(PG) 0.84 0.74 94(PG) 0.7 0.99 98(SG) 3 0.86 0.96 94(SG) 0.7 0.7 0(SF) 5.05.05 03(SF) 0.3. 08(PF) 4 0.67.4 06(PF) 8.3.0 (C) 8..0 (C) 8.5.7 Tabe 4 LTUvsARG The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea LTU Tea ARG 9(PG) 0.63 0.98 8(PG) 4 0.85 0.80 98(SG) 0.53 0.86 98(SG) 6.07 0.98 0(SF) 4.54 0.96 0(SF) 9.43.04 09(PF) 0.5.0 08(PF).6.07 (C) 4.0.4 (C) 3 0.4.4 Tabe 5 ESPvsUSA The frst round neup's rebound nuber, the technque, the rebound rato coeffcent Tea ESP Tea USA 9(PG) 0.56 0.86 94(PG) -6.67 0.95 00(SG) 0.45 0.95 94(SG) 0 0.00 0.6 04(SF) 5..04 03(SF).06.03 07(PF) 4 0.83.05 06(PF) 7.7.30 5(C) 8.94.5 (C) 6.3.46 Tabe 6 ESPvsLTU,ARGvsUSA,LTUvsARG,ESPvsUSA Projects coputed resut R R P ESP 00.40 5.60 0.46.05 0..46 0.65 LTU 0.33 5.0 8.69. -0.06 4.9-0.5 ARG 00.97 4.54 7.5.5 0.6 0.77 0.8 USA 0.3 5.3 0.47.9 0. 3.4 0.77 LTU 99.90 3.50 9.0.68 0.09.0 0.53 ARG 00.4 6.36 7.3 3.50 0.8 0.55 0.37 ESP 00. 3.38 7..5 0.09.86 0.64 USA 0.8 5.04 0.57 3.9 0.6 3. 0.84 0.7 P.0 obvous reaton,0.4 P<0.7 reaton,0. P<0.4 qute reaton,0<p<0. no reaton Fg 7 LTUvsESP The reatona graph about the heght and the rebound's nubers Fg 8 ARGvsUSA The reatona graph about the heght and the rebound's nubers SSc ea for contrbuton: edtor@ssci.org.uk
Internatona Journa of Sports Scence and Engneerng, 4 (00), pp 06-4 3 Fg 9 LTUvsARG The reatona graph about the heght and the rebound's nubers Fg 0ESPvsUSA The reatona graph about the heght and the rebound's nubers The graphs show that the average heght of above four teas are cose, except startng PG and SG, the other postons do not have rearkabe dfference. Most technca vaues of four teas are ore than or neary the dea vaue n the above foruas; therefore, we can thnk that the percentage that depends on technques to obtan rebound s qute hgh. In the sefna, USA VS ARG, the average heght of both teas s cose, but technca vaues of starters n ARG are hgher than that n USA. Athough USA won the atch, tota rebound nubers of ARG are ore than those of USA. Fro the atch vdeo we can see that ore rebound nubers gve ARG a bg advantage. In the fna, USA VS ESP, fve of startng 0 payers W are over, partcuary C of ESP reaches W=.94. In addton, tabe 4 dspays that P of 4 teas are generay hgh, whch ndcates that hgh rebound nubers depend on ta payers. Data of graph 7, 8 and 9 concentrate on the rght and t evdenty shows that ta payers are an force to secure rebound. It can be seen that ta heght dfference s st an portant factor that affects the rebound nuber. 4.3. The anayzes about 0 copettons Tabe 7 0 copettons, 84person's coputed resuts R p 00.6 4.36 0.3 3.77 0.54 0.7 P.0 obvous reaton,0.4 P<0.7 reaton,0. P<0.4 qute reaton,0<p<0. no reaton Fro tabe 5, the average heght of 84 payers s 00.6c, and the average rebound nuber s 4.36. =0.3 eans that every c heght dfference eads to 0.3 rebound nuber dfference accordng to the above forua. Correaton coeffcent s 0.43, whch ndcates that there s a correaton between heght dfference and the rebound nuber. It can be seen fro above graphs that payers who are fro 95c to 05c are an force to secure rebounds; therefore, SF, PF and C are an postons to obtan rebounds. 5. Concuson. It s showed n the concuson that technca vaues of teas that the average heghts are ow are reatvey hgh. However, n rea atches, the necessty of the rebound partcpaton of PG and SG s not essenta. The rebound acquston depends on PF and C. Both postons of ow teas copared wth postons of dde and hgh teas, the rebound acquston nuber s a ow vaue, so the regresson coeffcent and the correaton coeffcent n teas are ow.. It s showed that the correaton coeffcent n 0 atches s 0.54.There s the correaton n heght dfference and the rebound acquston nuber. 3. In the tea whose average heght s ow but power guards and shootng guards are reatvey techncay hgh, the technca superorty can ake up the weakness of the heghts. Therefore, takng these two factors nto account thoughtfuy the power of the tea can be estated objectvey and effectvey. SSc ea for subscrpton: pubshng@wau.org.uk
4 6. References Jng L: Takng about the Infuences of Heght and Technque for Obtan the Rebound on the Basketba Gae [] Jng-sheng Chen. Present Reboundng Technques of the Chnese Men s Basketba Tea [J]. Journa of Bejng Sport Unversty. 004, (): 553-554. [] Bao-zhu Wang. An Anayss and Study of Chna Man's Basketba Match at the 8th Oypc Gaes[J]. Journa of Guangzhou Physca Educaton Insttute. 005, (3): 0-3. [3] Jan-jun Yue. Coparson and Anayss of Copetton Stuaton of Chnese Men Basketba Tea and Its Copettors n the8th Oypc Gaes [J]. Journa of Shenyang Physca Educaton Insttute. 005, (): 09-0. [4] www.sna.spots.co. [5] www. 008.oypc.cn. SSc ea for contrbuton: edtor@ssci.org.uk